When Goku SSJ4 and Vegeta SSJ4 fight, if Goku wins he speaks in Japanese instead of English at the end of the match.

When fighting Super Saiyan Trunks (with the tied back hair) and he executes a Finish Buster, he says it in Japanese, similar to Dragon Ball Z: Ultimate Battle 22.

When using Long Haired Trunks, do his Burning Attack move. His voice will change to Japanese.

In COM vs. COM mode, if SSJ4 Goku fights and wins against SSJ4 Vegeta he will speak in Japanese after the battle, even if the Japanese voices are turned off.